Adjustment of jaw brakes



`May 13 1924.

i752 ya?? Zar Zfkzaeafz w wr E. BUISSON ADJUSTMENT-OF JAW BRAKES Filed April 24. 1922 Patented lMay13, 1924.

UNITED STATES '1,493,803 PATENT oFFlcE.

IIllU'G'I`|I\l`E BUISSON, F PARIS, FRANCE, ASSIGNOR T0 SOCIETE ANONYME FRANCAISE DU FERODO, OF PARIS, FRANCE.

vA DJUs'riacrruv'r or -JAW BRAKES.

Application led April 24, 1922. Serial No., 556,153.

To all whom t may concern.'

' Be it lmown that I, EUGNE BUISSON, a citizen' of the Republic of France, and re- ;sid-ing at Paris, Seine Department, No.v 2l

Rue de Chateaudun,"in the Republic of France, industrial, have invented certain new and useful Improvements in the Ad- -justment of Jaw Brakes, of which the'following is a specification. y

-This invention relates to a device for adjustment and fontaking up the wear which is applicable to jaw-brakes and enables Athe adjustment to be carried out-from the exparts.

terior of the brake drum -without removing the wheel and in an independent manner for each jaw. n

The saiddevice preferably comprises for each of the jaws a rod whereof one end is caused to` bear upon the common pivot of the jaws and the other end rests upon an eccentric axle mounted in the respective jaw.- By-modifying the angular position of the said eccentric axle the jaw may be caused to approach or to recede from its pivot there? by increasing or: diminishing the braking action as desired. The said axle may be mounted in the jaw by screwing and in such manner as to enable the operation lfrom the exterior through a suitable aperture, without being obliged to dismount any of the The accompanying drawing shows by way of example a form of construction of a brake according to the invention.'

Fig. 1 is a view one-half in section and one-half in elevation of the said brake. the drum being removed.

Fig. 2 is a section on the line AA, Fig. 1. j

The jaws 1 and 2 Aof the brake are pivoted on an axle 3 under the action of an eggwhich is formed in eccentric position on a screw 10. The said screw engages the jaw and is revoluble from the exterior through an aperture provided in the plate used as a support for the brake-operating elements;

It is therefore feasible.,without previous dismounting of any of the elements, and by simply turning the sc-rewl() in the desired sense, to move the axle 9 with reference to the centre of the said screw, thereby driving the brake shoe in question towards the periphery of the drum' when the -wear of the facing shall render this adjustmentl necessary.

By this first4 operation, which is equivalent to an expansion by an increase in diameter, the brakeshoe is .not 'only applied to the part of the drum adjacent 'thev regulating element, lbut it will be slightly raised with a certain degree of rotation and might even c ome 'into contact with the cam 4 on the at side. Contact thus takes place upon the whole region of the drum covered by the shoe.

Inversely, ,with the cam 4 at the dead point, it is remarked that the brake is caused tobear on the side next the pivot whilst the side next the cam is not engaged. I't might Lhappen that during the 4operation of the brake` a violent shock could cause the breakage of the shoe, especially-should the latter be of soft cast iron or cast steel. Such acl' cidents are obviated by turning the screw 10 in the sense opposite the one ka'bove indicated until the action of the caml causes the shoes to come into exact contact with the which .can be 'interior wall vof the drum. This second operation gives rise to the construction of the desired'degree such as is found necessary for each, and this'can be effected until the facing of the brake-shoes is entirely worn out.

In this manner it will be feasible to provide for all defects in the jaws whether with or without facing. more close and exact in that the drums which are always secured to the wheels do not require dismounting but on-the contrary'are to remain in place. It will suce, although this precaution is not absolutely necessary, 105

to raise'the axle by means of a jack in order to closely observe the braking pressure and to take up the wear in an exactmanner.

The end alone of the `screw 10 may be threaded, Fig. The jaws can be provided 110 The adjustment is the 10o with suitable facings 12 which may for instance be secured by rivets.. Adjacent the pivot 3, a mortise 13 may be? provided in the boss 'serving to guide the rod 5, so that the rivets can 'be placed near this end of the jaw. It is'v obvious that the shape of the screw 10 can be modified Without departing from the' invention.

I claim: l A jaw brake comprising tWo jaws, an axle having the said jaws pivoted thereon` a rod mounted upon each end of a jaw ad'acent lthe said pivot, the said'rod being slida le in the said jaw and adapted to pivot upon the said pivot, an axle disposed uponeach jaw, the said axle having an eccentric form and being revoluble linthe said jaw, one end of the said rod being caused to bear upon the eccentric portion `of the said axle whereby .the rotation ofthe said axle shall effect the v ad'ustment" of the said rod.

n testimony that I claim the foregoing l as my invention,4 I have signed my name 1n presence ofptwo subscribing Wltnesses.

EUGNE BUISSON. 

